Table 4.
Effect of organic and inorganic amendments on soil chemical properties after three years of amendment and cultivation of rice–wheat cropping system.
| Treatments | T1 | T2 | T3 | T4 | T5 | T6 | LSD (P = 0.05) |
|---|---|---|---|---|---|---|---|
| pH (1:2) | 9.1 ± 0.02 | 8.6 ± 0.01 | 9.0 ± 0.01 | 9.0 ± 0.02 | 8.7 ± 0.01 | 8.5 ± 0.01 | 0.21 |
| EC2 (dS m−1) | 0.83 ± 0.11 | 0.49 ± 0.12 | 0.70 ± 0.11 | 0.56 ± 0.13 | 0.48 ± 0.12 | 0.47 ± 0.11 | 0.10 |
| ESP | 47 ± 1.52 | 38 ± 1.23 | 42 ± 2.12 | 42 ± 2.11 | 40 ± 1.23 | 35 ± 1.42 | 3.36 |
| OC (g kg−1) | 3.10 ± 0.12 | 3.20 ± 0.11 | 3.20 ± 0.11 | 3.40 ± 0.11 | 3.70 ± 0.12 | 3.90 ± 0.11 | 0.14 |
| Available N (kg ha−1) | 123.5 ± 2.23 | 144.6 ± 2.36 | 140.2 ± 3.12 | 141.3 ± 2.26 | 153.3 ± 3.11 | 155.2 ± 3.12 | 2.23 |
| Available P (kg ha−1) | 16.60 ± 2.10 | 17.45 ± 1.53 | 18.23 ± 2.22 | 18.06 ± 1.63 | 21.20 ± 2.21 | 23.75 ± 2.11 | 1.51 |
| Available K (kg ha−1) | 246.1 ± 4.63 | 287.2 ± 4.52 | 301.3 ± 3.26 | 315.6 ± 6.23 | 327.6 ± 2.22 | 332.7 ± 2.22 | 8.23 |
| Ca++ (meq l−1) | 3.62 ± 0.01 | 6.20 ± 0.12 | 3.75 ± 0.11 | 4.20 ± 0.11 | 4.62 ± 0.12 | 5.75 ± 0.11 | 0.54 |
| Mg++ (meq l−1) | 3.00 ± 0.11 | 3.75 ± 0.06 | 3.37 ± 0.23 | 3.75 ± 0.12 | 5.35 ± 0.11 | 5.37 ± 0.26 | 1.12 |
| Na+ (ppm) | 296.16 ± 2.63 | 248.86 ± 4.23 | 289.81 ± 3.86 | 296.16 ± 4.52 | 271.66 ± 6.12 | 269.28 ± 4.23 | 12.21 |
| K+ (ppm) | 3.14 ± 0.001 | 2.74 ± 0.012 | 2.44 ± 0.013 | 3.21 ± 0.012 | 3.21 ± 0.012 | 4.37 ± 0.011 | 0.46 |
The values are mean ± SE of four replications.
T1—control (no amendments), T2—gypsum @ 50% G.R., T3—un-enriched MSW compost @ 10 t ha−1, T4—enriched MSW compost @ 10 t ha−1, T5—gypsum @ 25% G.R. + un-enriched MSW compost @ 10 t ha−1, T6—gypsum @ 25% G.R. + enriched MSW compost @ 10 t ha−1.
pH2 and EC2 soil and water suspension ratio of 1:2, OC organic carbon, ESP exchangeable sodium percentage, LSD least significant difference.